The book pictures the White House as a "Crazytown" ruled by the erratic behaviour of the President.
In one of the scenes described in the book, soon after taking office, Trump asked the Pentagon for a plan to launch a preventive military strike against North Korea, while criticizing the high cost of protecting South Korea.
Defence Secretary James Mattis left a meeting with Trump about that request "exasperated and alarmed," and told people in the President's inner circle that he had "acted like - and had the understanding of - 'a fifth- or sixth-grader,'" according to Woodward.
Woodward, whose 1974 reporting of the Watergate case in the Washington Post led to President Richard Nixon's resignation, said he based his book "Fear" on interviews with witnesses to the hidden secrets of the White House, who spoke on condition of anonymity.
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